diff --git a/src/main.cpp b/src/main.cpp
index b877657..176f933 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,40 +3,80 @@
 #include <iostream>
 #include <map>
 
-Register& getOrDefault(std::map<RegIndex, Register>& mapping, const RegIndex& lookup);
+using RegMap = std::map<RegIndex, Register>;
 
-int main() {
-	const constexpr size_t registerIndexPadding = 6;
+Register& getOrDefault(std::map<RegIndex, Register>& mapping, const RegIndex& lookup);
+std::pair<RegMap, uint32_t> mapFromRegister(Register listRegister);
+
+int main(int argc, char* argv[]) {
+	const constexpr size_t registerIndexPadding = 6, registerContentPadding = registerIndexPadding;
+	bool seperateInstructions = false;
+
+	for (int i = 1; i < argc; i++) {
+		if (!strcmp(argv[i], "--seperate-instructions"))
+			seperateInstructions = true;
+	}
+
+	const char instructionLabel = (seperateInstructions ? 'L' : 'R');
 	bool executing = true;
 
 	std::cout << "Please enter the program" << std::endl;
 
 	RegIndex pc = 0;
-	Register reg;
-	std::map<RegIndex, Register> registers{};
+	Register programReg;
+	std::map<RegIndex, Register> registers{}, program{};
 
-	std::cin >> reg;
-	auto registerStates = toList(reg);
-
-	std::cout << "\nRegister states at startup:\n";
-	RegIndex i = 0;
-
-	for (; i < registerStates.size(); i++) {
-		const auto registerState = registerStates[i];
-
-		registers.insert(std::make_pair(i, registerState));
-		std::cout << std::setw(registerIndexPadding) << i << ": " << registerState << " => ";
- 		printInstruction(std::cout, registerState) << std::endl;
+	if (!(std::cin >> programReg)) {
+		std::cerr << "Failed to read program from input" << std::endl;
+		return -1;
+	}
+
+	auto& programMap = seperateInstructions ? program : registers;
+	auto& registerMap = seperateInstructions ? registers : program;
+	uint32_t instructionCount, registerCount;
+
+	std::tie(programMap, instructionCount) = mapFromRegister(programReg);
+
+	if (seperateInstructions) {
+		std::cout << "Please enter the registers" << std::endl;
+
+		if (!(std::cin >> programReg)) {
+			std::cerr << " Failed to read register states from input" << std::endl;
+			return -2;
+		}
+
+		std::tie(registerMap, registerCount) = mapFromRegister(programReg);
+	}
+
+	std::cout << "\nProgram state at startup:\n";
+
+	if (seperateInstructions)
+		std::cout << "Program:\n";
+
+	for (auto&& instruction : programMap) {
+		std::cout << instructionLabel << std::setw(registerIndexPadding) << instruction.first << ": " << std::setw(registerContentPadding) << instruction.second << " ==> ";
+		printInstruction(std::cout, instruction.second) << "\n";
+	}
+
+	std::cout << instructionLabel << std::setw(registerIndexPadding) << instructionCount << ": " << std::setw(registerContentPadding) << "0" << "... HALT\n\n";
+
+	if (seperateInstructions) {
+		std::cout << "Registers:\n";
+
+		for (auto&& instruction : registerMap) {
+			std::cout << "R" << std::setw(registerIndexPadding) << instruction.first << ": " << std::setw(registerContentPadding) << instruction.second << "\n";
+		}
+
+		std::cout << "R" << std::setw(registerIndexPadding) << registerCount << ": " << std::setw(registerContentPadding) << "0" << "...\n\n";
 	}
 
-	std::cout << std::setw(registerIndexPadding) << i << ": 0...\n\n";
 	std::cout << "Beginning Execution..." << std::endl;
 
-	registers.insert(std::make_pair(pc, reg));
+	registers.insert(std::make_pair(pc, programReg));
 
 	while (executing) {
-		std::cout << "L" << pc << "\t";
-		Register instruction = getOrDefault(registers, pc);
+		std::cout << instructionLabel << pc << "\t";
+		Register instruction = getOrDefault(programMap, pc);
 		printInstruction(std::cout, instruction) << std::endl;
 
 		if (instruction == 0) { /* HALT instruction. */
@@ -47,19 +87,19 @@ int main() {
 		auto splitInstruction = toPair<false>(instruction);
 
 		if (splitInstruction.first % 2 == 0) { /* R+ instruction */
-			RegIndex sourceRegisterIndex = splitInstruction.first.get_ui();
+			RegIndex sourceRegisterIndex = splitInstruction.first.get_ui() / 2;
 			RegIndex destinationLabel = splitInstruction.second.get_ui();
 
-			getOrDefault(registers, sourceRegisterIndex)++;
+			getOrDefault(registerMap, sourceRegisterIndex)++;
 			pc = destinationLabel;
 		} else {
-			RegIndex sourceRegisterIndex = splitInstruction.first.get_ui();
+			RegIndex sourceRegisterIndex = splitInstruction.first.get_ui() / 2;
 
 			auto branches = toPair<true>(splitInstruction.second);
 			RegIndex trueLabel = branches.first.get_ui();
 			RegIndex falseLabel = branches.second.get_ui();
 
-			auto& sourceRegister = getOrDefault(registers, sourceRegisterIndex);
+			auto& sourceRegister = getOrDefault(registerMap, sourceRegisterIndex);
 
 			if (sourceRegister > 0) {
 				sourceRegister--;
@@ -74,3 +114,18 @@ Register& getOrDefault(std::map<RegIndex, Register>& mapping, const RegIndex& lo
 	auto valueIter = mapping.try_emplace(lookup, Register{ 0 });
 	return valueIter.first->second;
 }
+
+std::pair<RegMap, uint32_t> mapFromRegister(Register listRegister) {
+	RegMap map;
+	auto registerStates = toList(listRegister);
+
+	RegIndex i = 0;
+
+	for (; i < registerStates.size(); i++) {
+		const auto registerState = registerStates[i];
+
+		map.insert(std::make_pair(i, registerState));
+	}
+
+	return std::make_pair(map, i);
+}
diff --git a/src/register.cpp b/src/register.cpp
index bdc8c7f..59e9200 100644
--- a/src/register.cpp
+++ b/src/register.cpp
@@ -11,6 +11,7 @@ std::pair<Register, Register> toPair<false>(Register unsplit) {
 		x++;
 	}
 
+	/* Skip the first 1 bit. */
 	unsplit >>= 1;
 
 	return std::make_pair(x, unsplit);
@@ -26,6 +27,7 @@ std::pair<Register, Register> toPair<true>(Register unsplit) {
 		x++;
 	}
 
+	/* Skip the first 0 bit. */
 	unsplit >>= 1;
 
 	return std::make_pair(x, unsplit);